Actinic-ray-curable ink set for ink-jet recording

Patent metadata

Field	Value
Publication number	US-10526499-B2
Application number	US-201716092303-A
Country	US
Kind code	B2
Filing date	Apr 13, 2017
Priority date	Apr 26, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

To provide an actinic-ray-curable ink set for ink-jet recording which is excellent in thick-film curability even when a UV-LED lamp is used as a light source, and has uniform curing sensitivity across different colors. The present invention relates to an actinic-ray-curable ink set for ink-jet recording, characterized in that a cyan ink contains a phthalocyanine pigment, a radical polymerizable compound, and less than 10% by mass of a photopolymerization initiator based on the total amount of the cyan ink, a magenta ink contains a quinacridone-based pigment, a radical polymerizable compound, and less than 5% by mass of a photopolymerization initiator based on the total amount of the magenta ink, a yellow ink contains an azo pigment, a radical polymerizable compound, and less than 10% by mass of a photopolymerization initiator based on the total amount of the yellow ink, and a black ink contains a carbon black, a radical polymerizable compound, and less than 12% by mass of a photopolymerization initiator based on the total amount of the black ink.

First claim

The invention claimed is:

1. An actinic-ray-curable ink set for ink-jet recording, comprising a cyan ink, a magenta ink, a yellow ink, and a black ink,
the cyan ink comprising a phthalocyanine pigment, a radical polymerizable compound, and 3 to 10% by mass of a photopolymerization initiator based on the total amount of the cyan ink, wherein an acylphosphine oxide-based photopolymerization initiator in the photopolymerization initiator in the cyan ink comprises bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at a mass ratio of 0.1 to 0.4;
the magenta ink comprising a quinacridone-based pigment, a radical polymerizable compound, and 1 to 5% by mass of a photopolymerization initiator based on the total amount of the magenta ink, wherein an acylphosphine oxide-based photopolymerization initiator in the photopolymerization initiator in the magenta ink comprises bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at a mass ratio of 0.4 to 0.8;
the yellow ink comprising an azo pigment, a radical polymerizable compound, and 3 to 10% by mass of a photopolymerization initiator based on the total amount of the yellow ink, wherein an acylphosphine oxide-based photopolymerization initiator in the photopolymerization initiator in the yellow ink comprises bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at a mass ratio of 0.1 to 0.4; and
the black ink comprising a carbon black, a radical polymerizable compound, and 5 to 12% by mass of a photopolymerization initiator based on the total amount of the black ink, wherein an acylphosphine oxide-based photopolymerization initiator in the photopolymerization initiator in the black ink comprises bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at a mass ratio of 0.1 to 0.4.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Saito Naohito

Classifications

• C08F2/46

  Polymerisation initiated by wave energy or particle radiation · CPC title

• B41M5/00

  Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00}) · CPC title

• C09D11/324

  containing carbon black · CPC title

• B41M7/0081

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title

• C09D11/322

  Pigment inks · CPC title